Lampert was General Leslie Groves' executive officer as part of the Manhattan Project after World War II.

In January 1944 he became the XIV Corps chief engineer, where he participated in the invasion of Luzon, Philippines, and the subsequent liberation of Manila in March 1945.

He then was assigned to Saigon, Vietnam, where he became Deputy Chief for Logistics for the Military Assistance Advisory Group-Vietnam (later MACV).

After his tour in Vietnam, Lampert was assigned to the Pentagon as the director of military construction at the Office of the Chief of Engineers, a post he held until assuming command at West Point in as the 46th Superintendent (1963–1966).

Lampert contracted cancer and died at Walter Reed Army Medical Center in Washington, D.C., in 1978.

[4][6] Lampert married Margery Frances "Gerri" Mitchell on June 26, 1937, at the Military Academy Cadet Chapel.